I am trying to import mysql database in helm control panel. But there is no option i found in helm.
Please guide me how can i do this?

you will need to ask your provider where to load the phpMyAdmin or they can import the SQL file you give them (if they can do it for you)

actually, we only develop site and site owner already contact with support and no reply from many days. My project going late only because of this.
Is helm have phpmyadmin option? or we need to install it separately?

By default, HELM does not have phpMyAdmin, you can choose to install on the server and run the phpMyAdmin.

any other option to import myqsl in helm?

Connect your MySQL using Client softwares like MySQL Frong or HeidiSQL and then you can try restoring the database from the dump backup file.

You can install phpMyAdmin only on your domain name... just download it and unpack and follow the inctructions. I think it will be helpful for you in the future too.

As connection info you should use your database username and password which you can create via HELM.